This is a bit long winded, but some might find it amusing....

I had the same hvac company that replaced the system in my commercial building come out to the house and replace my 28 year old Carrier heat pump. They did a fine job... with the heat pump.

The next day, we got up and there was no hot water, thinking that the electric hot water heater had breathed it's last, I pulled off the cover to test the elements and what not, only to find out it wasn't getting any power, and the breaker wasn't blown. Huh?... what a head scratcher.

In desperation, I pulled off the panel box cover to find that the hot water breaker was plugged in, but the wires were not connected. Wtf? Then, I noticed that the breaker was a worn out used one, and was a 30amp, not the 20 amp that was there the day before. Somehow, the moron that did the hvac work, opened the panel box and simply switched it out, his mistake was forgetting to hook it up. I still can't figure out why, even though he admitted to doing it when confronted by the owner. I can't figure out why he removed the panel box cover, the new unit draws less amps than the old one, and the county code inspector even scratched his head when he came to inspect the hvac job.